Improvement in stone drilling and dressing machines



F. A. GRANT & W. P. CROUCH.

STONE DRILLING AND DRESSING MACHINE.

Patented Apr'1118, 1876.

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UNITED STATES FREDERICK A. GRANT AND WILLIAM P. CROUCH, OF WABASH,INDIANA. I

PATENT OFFICE.

IMPROVEMENT IN, STONE DRILLING AND DRESSING MACHINES.

Specification forming part of Letters Patent No. I 76,132, dated April18, 1876; application filed September 1, 1875.

To all whom it may concern Be it known that we, FREDERICK A. GRANT andWILLIAM P. CROUCH, of Wabash, in the county of Wabash and State ofIndiana,have in vented certain Improvements in Drilling and DressingStone, of which the following is a specification: v

The purpose of 'our invention is in a new and useful way to drill ordress stone.

The force producing the effect is in the revolution of the wheel A A onthe axis B, by hand or any other force. This wheel is set solidly in theinside frame C D E F, so accommodated in the external frame G H I thatthe inside frame containing the wheel can be lowered or lifted along thesides G H l by the le ver K, on which the inside frame is suspended.Thus, as the work goes on, the adjustment of the blows of the hammers tothe drill or dresser is accomplished by that lever lift ing or loweringthe inside frame which moves up and down the sides G' H I of theexternal frame. Its elevation depends on the slip of the .slot N and thepins 0 c c c.

The wheel A A on the axis B is made of two parallel sides, withsufiicient spaces between, and no more, for the hammers to rise andfall. 'Between these sides, and between the axis and circumference ofthe wheel A A, one or more hammers L L are attached eccentrically, so asto be moved forward with the revolution of the wheel. The attachment ofthe hammers is by a slot, X X, allowing a play of the hammers backwardand forward by the slot. This contrivance controls and directs the fallof the hammer exactly on the drill or dresser. M represents the drill ordresser, which plays free up and down in a shank, Z, which is part ofthe inside frame. As the wheel A- A revolves the hammers L L are thrownforward by a blow on the head of the drill or dresser M. In thecircumference of the wheel A A slots P P are out, according to thenumber of hammers. As the hammer recoils from the blow, the revolutioncontinuing, the hammer retires by the slot till it falls off the drillor dresser, and then goes forward in the continuing revolution.

Figure 1 represents the several parts above described.

To make the drill effective in drilling stone, it must be turned atevery blow. This is done by means of the ratchet Q on the drill, asshown in Fig. 2, which ratchet is turned by the pendulum S, governed bythe spring It, every blow of the hammer L striking the pendulum, and, byits action, throwing the pendulum forward, the pendulum returning to itsplace, after the hammer passes, by the force of the spring. 1

When the dresser is used, a spring, W, working with straddles, as shownin Figs. 3 and 4, is fixed onto the shankZ, so that at each blow therecoil of the spring will lift the dresser from the face of the stone.

The machine stands on the legs U U U U, as shown in Figs. 5 and 6, inloops, so that they may be set up or down to accommodate the machine tothe surface of the stone, and then held in place by the screws V V V V.

When the dressers are used, rollers T T, as shown in Fig. 5, are fixedinto the legs, so as to move it freely over the surface of the stone.

We claim as our invention 1. The wheel with parallel sides, but withsnflicient space between, and no more, with hammer attached, to allowthe rise and fall of the hammer, substantially as and for the purposehereinbefore set forth.

2. The attachment of the hammer to the revolving wheel ecceut-rically,and so as to be moved back and forth by the slots X X, substantiallyasand for the purpose set forth.

3. The revolution of the drill or dresser at the blow of the hammer, bythe use of the pendulum and spring, substantially as and for the purposeset forth.

4. The combination of the several parts into a machine, substantially asand for the uses and purposes set forth.

FREDERlCK A. GRANT. WILLIAM P. CROUCH. V

Witnesses:

N. D. MYERS, J. P. Ross.

